I owned an Ownes and Sons tandem axle trailer (now belongs to Griff on this board) and had no problems with it. I purchased it through Ducky's Boats in PA. Granted, I only owned it for just over a year, but it seemed to be a well built trailer. The one I had was the aluminun I-Beam version. My only modification I made from the way they built it was to remove the guide poles and mount the tail lights low behind the fenders. I used it to carry a 28' Pantera and it did so really well.
www.duckysboats.com Ducky's Boats
www.slideon.com Owens & Sons